The Columbia Sportswear™ Adults' Bora Bora™ Booney II Hat features Omni-Shade™ UPF 50 sun protection to help shield you from UV rays, and an Omni-Wick™ sweatband and mesh to wick away moisture to help keep you cool and dry. Made from 100% textured nylon poplin material with polyester lining, the hat has an adjustable chin strap with a draw cord and toggle.